Eric is a full featured Python and Ruby editor and IDE, written in Python. It is based on the cross platform Qt GUI toolkit, integrating the highly flexible Scintilla editor control. It is designed to be usable as an everyday quick and dirty editor as well as being usable as a professional project management tool, integrating many advanced features that Python offers the professional coder. Eric includes a plug-in system, which allows easy extension of the IDE functionality with plug-ins downloadable from the net. Current stable versions are Eric4 based on Qt4 and Python 2 and Eric5 based on Python 3 and Qt4.

WireframeSketcher is a software tool that helps product managers, designers, and developers quickly create wireframes, mockups, and prototypes for desktop, Web, and mobile applications. It’s a standalone application and a plug-in for any Eclipse IDE.

ZK is a highly productive Java framework for building amazing enterprise Web and mobile applications. With event-driven components and an XUL-based markup language, developing is as simple as programming desktops and authoring HTML. Scripting languages include but are not limited to Java, JavaScript, Ruby, and Groovy.

mxGraph is a JavaScript library that uses built-in
browser capabilities to provide an interactive
drawing and diagramming solution. Target
applications are Web based applications that
require workflow/BPM, diagram, network, or general
graph editing to be available in-place on a Web
page.

Wt is a C++ library for developing Web
applications with an API that is widget-centric
and inspired by existing C++ graphical user
interface APIs. To the developer, it offers
abstraction of Web-specific implementation details, increasing the accessibility and portability. Under the hood, the library uses the latest techniques (HTML5, Ajax, WebSockets) to handle user events and update the Web page.

JGraph is a free, mature, and robust Java diagramming library. It contains all the graph visualization, layout, and interaction functionality you might expect in a graph library, including multiple views, layering, zoom, drag and drop, undo, automatic expanding and collapsing, routing, and layouts. You can create workflow editors, BPMN, CAD tools, network diagrams, database visualization tools, and more. It is fully documented, including examples, and has an active support community.

JFormDesigner is a professional GUI designer for Java Swing user interfaces. It supports JGoodies FormLayout, GroupLayout (Free Design), TableLayout, and GridBagLayout. It decreases the time you spend on hand coding forms.

Stunnix Advanced Web Server is a Web server for
putting Web sites onto CD-ROMs, DVDs, FlashDisks,
and other readonly media to be used on any typical
system. Sites can be scripted with PHP, Python,
Java, or Perl and can be driven by MySQL or SQLite
databases. All required software programs are
designed to reside on the CD-ROM to avoid the need
to install software on the user's computer. The
Web serving core is based on Apache 1.3.x, and has
additional functionality to detect and use free
ports and automatically start a browser on each
platform. Desktop applications can also be created
with it.

SANE stands for "Scanner Access Now Easy" and is an application programming interface (API) that provides standardized access to any raster image scanner hardware (flatbed scanner, handheld scanner, video and still cameras, framegrabbers, etc.). The SANE standard is public domain and its discussion and development are open to everybody. The source code is written for UNIX (including Linux) and is available under the GPL, but commercial applications and backends are welcome. The package contains the libraries, net support, and scanimage. The X frontends xscanimage and xcam can be found in sane-frontends.

qooxdoo is a universal JavaScript framework that enables you to create applications for a wide range of platforms. With its object-oriented programming model you can build rich, interactive applications (RIAs), native-like apps for mobile devices, traditional Web applications, or even applications that run outside the browser. Its integrated tool chain allows you to develop and deploy applications of any scale, while taking advantage of a comprehensive feature set and a state-of-the-art GUI toolkit.